FIX: #65 replace deprecated request to axios

[Charlygraphy23]

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• [x] Replace request package with axios
• [x] Lint Errors

[Charlygraphy23]

FIX: replace deprecated request to Axios #65 (Dependency update: 2 moderate severity vulnerabilities)

[656d696c65]

Thanks @Charlygraphy23 for the work. Using now Brevo commercially, it seems important to me to remove the deprecated lib.

Some docs for the reviewers:

• request is fully deprecated since february of 2020 (source)
• here is why